Study of Plasma Sprayed Al_2O_3-TiO_2 Coatings from Nanoparticle Feedstock Powders

摘要

In this paper, Al_2O_3-TiO_2 coatings prepared by plasma spraying of reconstituted Al_2O_3 and TiO_2 nanoparticle powders were investigated. The microstructure of the coatings was characterized by SEM and X-ray diffraction and the mechanical properties were measured. The analysis of the microstructure shows that the Al_2O_3-TiO_2 coatings such produced consist of fully melted and splash-quenched regions and partially melted nanostructured regions. Comparisons of microhardeness and wear resistance were made between the plasma sprayed Al_2O_3-TiO_2 coatings from the nanoparticle powders and the conventional coatings. The results indicate that the nanostructured coatings exhibit higher microhardness and wear resistance than the conventional coatings.